公开(公告)号：US10574215B2

公开(公告)日：2020-02-25

申请号：US16414838

申请日：2019-05-17

Applicant: TDK CORPORATION

Inventor： Jiro Yoshinari ,  Tomoyuki Sasaki ,  Yohei Shiokawa

IPC: G11C11/06 ,  G11C11/00 ,  H03K3/84 ,  H01F10/32 ,  H01L43/08 ,  G06F7/58 ,  H01L43/04 ,  H04L9/08 ,  H01L27/22 ,  G06N3/063 ,  G06N10/00

Abstract: A random number generator capable of generating a natural random number using a spin-orbit torque (SOT) is provided. The random number generator includes a ferromagnetic metal layer and a spin-orbit torque wiring extending in a first direction crossing a lamination direction of the ferromagnetic metal layer and being joined to the ferromagnetic metal layer, wherein the direction of spins injected from the spin-orbit torque wiring into the ferromagnetic metal layer and an easy magnetization direction of the ferromagnetic metal layer intersect each other.

公开(公告)号：US10546995B2

公开(公告)日：2020-01-28

申请号：US15778115

申请日：2016-11-25

Applicant: TDK CORPORATION

Inventor： Yohei Shiokawa ,  Tomoyuki Sasaki

IPC: G11C11/16 ,  G01R33/09 ,  H01L43/08 ,  H03B15/00 ,  H01L43/06 ,  H01L27/22 ,  H01L43/02 ,  H01L43/10 ,  H01L43/14

Abstract: A spin current magnetization reversal element includes: a first ferromagnetic metal layer with a changeable magnetization direction, and a spin-orbit torque wiring, wherein a first direction is defined as a direction perpendicular to a surface of the first ferromagnetic metal layer, the wiring extends in a second direction intersecting the first and is bonded to a first surface of the first ferromagnetic metal layer, wherein the wiring includes a pure spin current generator which is bonded to the metal layer, and a low-resistance portion which is connected to both ends of the generator in the second direction and is formed of a material having a smaller electrical resistivity than the generator, and the generator is formed so that an area of a cross-section orthogonal to the first direction continuously and/or stepwisely increases as it recedes from a bonding surface bonded to the first ferromagnetic metal layer in the first direction.

公开(公告)号：US10439130B2

公开(公告)日：2019-10-08

申请号：US15702290

申请日：2017-09-12

Applicant: TDK CORPORATION

Inventor： Tomoyuki Sasaki ,  Yohei Shiokawa

IPC: H01L43/06 ,  G11C11/16 ,  H01L43/04 ,  H01L43/10 ,  H01L43/12 ,  G11C11/18 ,  H01L43/08 ,  H01L27/22

Abstract: A spin-orbit torque type magnetoresistance effect element including a magnetoresistance effect element having a first ferromagnetic metal layer with a fixed magnetization direction, a second ferromagnetic metal layer with a varying magnetization direction, and a non-magnetic layer sandwiched between the first ferromagnetic metal layer and the second ferromagnetic metal layer; and spin-orbit torque wiring that extends in a first direction intersecting with a stacking direction of the magnetoresistance effect element and that is joined to the second ferromagnetic metal layer; wherein the magnetization of the second ferromagnetic metal layer is oriented in the stacking direction of the magnetoresistance effect element; and the second ferromagnetic metal layer has shape anisotropy, such that a length along the first direction is greater than a length along a second direction orthogonal to the first direction and to the stacking direction.

公开(公告)号：US10319901B2

公开(公告)日：2019-06-11

申请号：US15705991

申请日：2017-09-15

Applicant: TDK CORPORATION

Inventor： Tomoyuki Sasaki ,  Yohei Shiokawa

IPC: G11C11/00 ,  H01L43/04 ,  G11C11/16 ,  H01L43/08 ,  H01L43/10 ,  H01L43/14 ,  G11C11/18

Abstract: A spin-orbit torque type magnetization reversal element including a ferromagnetic metal layer with a varying magnetization direction; and spin-orbit torque wiring that extends in a first direction intersecting with a stacking direction of the ferromagnetic metal layer and that is joined to the ferromagnetic metal layer; wherein when viewed from the first direction, the spin-orbit torque wiring is asymmetrical in a second direction that is orthogonal to the first direction and the stacking direction, with respect to an axis that passes through a center, in the second direction, of the ferromagnetic metal layer.

公开(公告)号：US20190088711A1

公开(公告)日：2019-03-21

申请号：US15840377

申请日：2017-12-13

Applicant: TDK CORPORATION

Inventor： Yohei Shiokawa ,  Tomoyuki Sasaki

IPC: H01L27/22 ,  H01F10/32 ,  H01L43/04 ,  H01L43/06 ,  H01L43/08 ,  G11C11/16 ,  G11C11/18

Abstract: A spin current magnetization rotational element includes: a spin-orbit torque wiring extending in a first direction; and a first ferromagnetic layer laminated in a second direction intersecting with the spin-orbit torque wiring, wherein the first ferromagnetic layer comprises a plurality of ferromagnetic constituent layers and at least one inserted layer sandwiched between adjacent ferromagnetic constituent layers, and polarities of spin Hall angles of two layers, which sandwich at least one of the ferromagnetic constituent layers among the plurality of the ferromagnetic constituent layers, differ.

公开(公告)号：US20180337327A1

公开(公告)日：2018-11-22

申请号：US15976997

申请日：2018-05-11

Applicant: TDK CORPORATION

Inventor： Zhenyao Tang ,  Yohei Shiokawa ,  Tomoyuki Sasaki

IPC: H01L43/02 ,  H01F10/32

CPC classification number: H01L43/02 ,  G11C11/161 ,  G11C11/1675 ,  H01F10/3254 ,  H01F10/3268 ,  H01F10/3286 ,  H01F10/329 ,  H01L27/222 ,  H01L43/08

Abstract: A spin current magnetization rotational element includes: a ferromagnetic metal layer; a spin-orbit torque wiring configured to extend in a first direction perpendicular to a lamination direction of the ferromagnetic metal layer and formed on one surface of the ferromagnetic metal layer; and a ferromagnetic electrode layer formed outside the ferromagnetic metal layer on any of surfaces of the spin-orbit torque wiring in a top view from the lamination direction. A direction of magnetization of the ferromagnetic metal layer is changeable by spin-orbit torque generated by a spin-orbit interaction in the spin-orbit torque wiring and an influence of spin diffused from the ferromagnetic electrode layer.